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简介：ＷｅｌｄｑｕａｌｉｔｙｃｏｎｔｒｏｌｂｙｎｅｕｒａｌｎｅｔｗｏｒｋＨｕａｎｇＳｈｉｓｈｅｎｇ；ＬｉＤｉａｎｄＳｏｎｇＹｏｎｇｌｕｎ（ＳｏｕｔｈＣｈｉｎａＵｎｉｖｅｒｓｉｔｙｏｆＴｅｃｈｎｏｌｏｇｙ）Ａｂｓｔｒａｃｔ：Ａｒｔｉｆｉｃｉａｌｎｅｕｒａｌｎ...

简介：ThelaserbeamweldingofBT20titaniumalloywasconductedtoinvestigatetheweldshape,microstructuresandproperties.ThefullpenetrationweldcharacteristicsproducedbyCO2laserandbyYAGlaserwerecompared.TheresultsshowthatthefullpenetrationweldofYAGlaserweldingclosesto"X"shape,andweldofCO2laserweldingis"nail-head"shape.Thoseresultfromspecialheatingmodeoflaserdeeppenetrationwelding.ThetensionstrengthofCO2laserandYAGlaserjointsequaltothatofthebasemetal,buttheformerhasbetterductility.Allweldsconsistmainlyoftheacicularαphaseandafewβphaseinmicrostructure.ThedendriticcrystalofCO2laserweldisalittlefinerthanYAGlaserweld.AccordingtheresearchCO2laserisbetterthanYAGlaserforweldingofBT20titaniumalloy.

简介：ＮｏｎｄｅｓｔｒｕｃｔｉｖｅｔｅｓｔｏｆｗｅｌｄｒｅｓｉｄｕａｌｓｔｒｅｓｓｅｓｂｙａｃｏｕｓｔｏｅｌａｓｔｉｃｔｅｃｈｎｉｑｕｅＪｉａｏＦｕｊｉｅ；ＺｈａｎｇＷｅｎｊｕｎａｎｄＹｕａｎＺｈｉｋａｎｇ（ＳｈａｎｇｈａｉＵｎｉｖｅｒｓｉｔｙｏｆＥｎｇｉ...

简介：Itisofgreatimportanceforobtainingtheperfectweldingpropertiestocontroltheacicularferrite(AF)transformationbehaviorreasonablyinsteelweld.AFcontinuoustransformationkineticsintheHSLAsteelweldwascalculatedandmodeledbasedonthedirectgrowthontheinclusionsinertinterface.Thesimulationresultsarecoincidentwiththeexperimentalvaluewell.

简介：Inthispaper,laserinducedplasmasignalswereanalyzedduringkeyholeweldingthroughthreemethods.Accordingtotheresults,therelativitybetweenopticalandacousticsignalsofplasmaisshownwhenweldsareinfull-penetration,orpartial-penetrationandnon-penetration.

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简介：Athermalconductionmodelisappliedtospeedupthenumericalanalysisofthetemperaturedistributionandtheweldpoolgeometryoffullpenetrationingastungstenarc(GTA)welding.Withconsideringbothtopandbottomfreesurfacedeformationoffull-penetratedweldpool,three-dimensionalweldpoolwithmeltingfrontandsolidificationfrontispredicted.Weldingexperimentsareconductedtomeasurethemeltingfrontcurvesatthetopsurfaceandthelongitudinalsectionoftheweld.Itshowsthatthepredictedandmeasuredresultsareingoodagreement.

简介：Byusingthermo-simulation,AugeranalysisandCharpyⅤimpacttestandwiththeobservationofthemicrostructuresinwhichcleavagecrackwasinitiated,themorphologyandtoughnessofthelocalbrittlezoneofC-MnandCr-Ni-Momultipassweldmetalshavebeeninvestigated.TheresultsindicatedthatthelocalbrittlezoneinC-MnweldmetalswithlowandhighMn％andCr-Ni-Moweldmetalsisdifferent.Withstatisticalanalysis,ithasbeenrevealedthatthemorethelocalbrittlezoneandthelowertheirtoughness,thelowerthetoughnessoftheentireweldmetals.Thealloyelementshaveanoticeableinflu-enceonthetoughnessofthelocalbrittlezone,therebychangingthetoughnessofweldmetals.

简介：模仿的austempered的一张连续冷却转变(CCT)图可锻的铁(ADI)焊接金属借助于Formastor-F图测量仪器被开发了，并且由与实际焊接作比较修订了。最后，修订的图被用来决定焊接技术。(编辑作者摘要)4个裁判员。

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简介：Thesingle-shotspiralmagneticresonanceimaging(MRI)techniquewasimplementedandoptimizedonaBrukerBiospec47/30scanner.Thetechniqueincludesthepulsesequenceforgenerationanddetectionofthek-spaceMRIsignal(freeinductiondecay(FID)),andPC-basedprogramsforthedatagridandimagereconstruction.Thetemporalresolutionis70ms(14imagespersecond),whichconsistsofadataacquisitiontimeasshortas13.7ms,aspin-echotimeof13.6msandamagnetizationrecoverytimeof43ms.Thismakesitpossibletotakereal-timeimagesofmovingobjects.Thetechniqueisdemonstratedusingapendulum(tube)filledwithwater.

简介：Theforcesactingonagastungstenarc(GTA)weldpoolareanalyzed.Amodelofstaticforceconditionforfally-penetratedweldpoolisdeveloped,andthecriterionissetuptojudgeandevaluatetheoccurrencetendencyofburn-throughdefect.Transientvariationsoftheforcesaffectingthesurfacesdeformationandcollapsingofweldpoolarecomputed,andthepercentagesoftheirinfluencingrolesareobtained.Forspecificmaterialandworkpiecethickness,thethresholdvaluesbelowwhichtheburn-throughphenomenondoesnotoccuraredetermined,andcomparedwiththeexperimentalresults.

简介：Theeffectofnonmetallicinclusionsinthedropletofthestainlesssteelcoveredelectrodeontheporositywasresearched.Theresultshowsthatthenonmetallicinclusionsinthedropletarespherical,theircompositionisdifferentfromtheoneofslagandtheinclusionshavethecharacterof"innerformation".Whentheratioofrutiletoilmeniteinthecoatedmaterialisincreased,thedropletbecomescoarse,thecontentofnonmetallicinclusioninthedropletdecreases,andtheporositysensitivityintheweldmetalalsodecreases.Whentheratiooffledspartoilmeniteinthecoatedmaterialisincreased,thedropletbecomesfine,thecontentofnonmetallicinclusioninthedropletincreases,andtheporositysensitivityintheweldmetalincreases.WhentheratioofFe2O3toilmeniteinthecoatedmaterialisincreased,thedropletbecomesfine,thecontentofnonmetallicinclusiondecreases,whiletheporositysensitivitydoesnotreduce.

简介：EffectsofalloyelementsonthemicrostructureandcrackresistanceofFe-C-Crweldsurfacinglayerwereinvestigated.Theresultsshowthatmicrostructuresofthelayermainlyconsistofcarbidesandaustenitematrix.IncreasingCandCrcontentsimpairthecrackresistanceofthelayerduetoincreasedamountofbrittlecarbides.TheadditionofNi,NborMoimprovesthecrackresistanceofFe-C-CrweldsurfacinglayerbyincreasingtheamountofausteniteandformingfineNbCorM7C3carbidesinthelayer.But,theexcessiveNb(>2.50wt%)orMo(>1.88wt%)impairsthecrackresistanceofthelayer,whichhasrelationwithincreasedcarbidesorcarbidecoarseningandaustenitematrixsolidsolutionstrengthening.ThepropercombinationofC,Cr,Ni,NbandMocanfurtherimprovenotonlythecrackresistanceofFe-C-CrweldsurfacinglayerbutalsotheerosionresistanceasaresultoffineNbCandM7C3carbidesdistributinguniformlyinaustenitematrix.Theoptimallayercompositionsare3.05wt%C,20.58wt%Cr,1.75wt%Ni,2.00wt%Nband1.88wt%Mo.

简介：Inthispaper,theweldpoolshapecontrolbyintelligentstrategywasstudied.Aneuronself-learningPSDcontrollerforbacksidewidthofweldpoolinpulsedGTAWwithwirefillerwasdesigned.ThePSDcontrolarithmeticwasanalyzed,simulatingexperimentbyMATLABsoftwarewasdone,andthevalidatingexperimentsonvariedheatsinkworkpieceandvariedgapworkpieceweresuccessfullyimplemented.Thestudyresultsshowthattheneuronself-learningPSDcontrolmethodcanattainaperfectcontroleffectunderdifferentsetvaluesandconditions,andissuitablefortheweldingprocesswiththevariedstructureandcoefficientsofcontrolmodel.

简介：Duetothedisturbancesofspatters,dustsandstrongarclight,itisdifficulttodetectthemoltenpooledgeandtheweldlinelocationinCO2weldingprocesses.Themedianfilteringandself-multiplicationwasemployedtopreprocesstheimageoftheCO2weldinginordertodetecteffectivelytheedgeofmoltenpoolandthelocationofweldline.TheB-splinewaveletalgorithmhasbeeninvestigated,theinfluenceofdifferentscalesandthresholdsontheresultsoftheedgedetectionhavebeencomparedandanalyzed.TheexperimentalresultsshowthatbetterperformancetoextracttheedgeofthemoltenpoolandthelocationofweldlinecanbeobtainedbyusingtheB-splinewavelettransform.Theproposededgedetectionapproachcanbefurtherappliedtothecontrolofmoltendepthandtheseamtracking.

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